Fixing Roller With Closed-Cell Silicone Elastomer
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Solution Overview
Problem
The existing fixing roller technology using silicone sponge as an elastic layer faces issues with uneven cell size and shape, leading to potential cell collapse under external forces, which reduces the durability and longevity of the roller.
Innovation Solution
A fixing roller is designed with a porous material layer made of closed cell-type silicone elastomer, prepared using a water-in-oil emulsion composition, which has a high closed cell ratio and uniform cell size distribution, eliminating the need for silicone sponge and enhancing durability by preventing cell collapse and stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicone sponge is used as an elastic layer in the fixing roller, then the roller can be manufactured with simpler processes and lower costs, but the cell size and shape become uneven leading to cell collapse under external forces and reduced durability
Solution Approach 1:
The patent uses a porous elastic layer made of closed-cell foam material with controlled cell structure. The porous structure provides the necessary elasticity and compressibility for the fixing roller while the closed-cell configuration prevents collapse under external forces. The cell size is controlled to be 0.5-2.0 mm in diameter, ensuring uniform distribution and structural integrity during operation.
Solution Approach 2:
The patent specifies precise parameter ranges for the elastic layer including cell size (0.5-2.0 mm), cell wall thickness (0.1-0.5 mm), and porosity (70-90%). These parameter controls ensure the material maintains structural integrity under external forces while providing the required elastic properties for the fixing roller operation.
2Reliability
If the porous material layer is made with uniform small cell size (50 μm or less for 50%+ of cells), then cell collapse is prevented and durability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for cell dimensions (50 μm or less for 50%+ of cells, with average cell diameter of 30 μm or less) and closed-cell ratio (60% or more). These parameter specifications ensure uniform cell structure that prevents collapse while maintaining manufacturability through controlled foaming processes.
Solution Approach 2:
The patent requires different regions of the elastic layer to have consistent cell structure properties, with at least 50% of cells meeting the size criterion of 50 μm or less. This local quality control ensures uniform performance across the entire elastic layer while allowing for practical manufacturing variations.
3Strength
If a thin-walled metal sleeve is added to cover the porous material layer, then the structural strength and axial displacement prevention are improved, but the device complexity increases
Solution Approach 1:
The patent combines a porous elastic layer (closed-cell foam) with a thin-walled metal sleeve to create a composite structure. The elastic layer provides compression and heat insulation properties, while the metal sleeve provides structural strength and prevents axial displacement. This composite design achieves multiple functions simultaneously without significantly increasing overall complexity.
Solution Approach 2:
The patent uses a thin-walled metal sleeve that acts as a flexible yet strong outer layer. The thin-walled construction provides sufficient structural support and axial constraint while maintaining the compressibility and elastic properties of the underlying porous material layer, achieving strength without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures the fixing roller maintains a usable state over long periods without cell collapse, improving durability and reliability by preventing relative movement and axial displacement between the porous material layer and the metal sleeve, thus extending its operational life.
Implementation Method 1
a porous material layer made of closed cell-type silicone elastomer prepared using an emulsion composition, which has a high closed cell ratio and uniform cell size distribution
Implementation Method 2
prepared using an emulsion composition, which has a high closed cell ratio and uniform cell size distribution
Data Source
AI summary
Disclosed is a fixing roller which comprises a core 16, a porous material layer 22 disposed in surrounding relation to an outer peripheral surface of the core 16, and a thin-walled metal sleeve 26 covering an outer peripheral surface of the porous material layer 22. The porous material layer 22 comprises a closed cell-type silicone elastomer. The present invention provides a fixing roller capable of ensuring enhanced durability and maintaining a usable state over long periods under the condition of being actually driven and rotated.